Objective C to ASP.net Web API file upload giving error Unexpected end of MIME multipart stream MIME multipart message is not complete

Question

I have following ASP.net WebAPI code which handles file uploads. Works great using a simple HTML file upload form.

public Task<IEnumerable<string>> UploadFile()
{
  if (Request.Content.IsMimeMultipartContent())
  {

      string fullPath = HttpContext.Current.Server.MapPath("~/uploads");

      MultipartFormDataStreamProvider streamProvider = new     MultipartFormDataStreamProvider(fullPath);

      var task = Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith(t =>
      {
         if (t.IsFaulted || t.IsCanceled)
         {
            throw new HttpResponseException(HttpStatusCode.InternalServerError);
          }

          var fileInfo = streamProvider.FileData.Select(i =>
          {
               var info = new FileInfo(i.LocalFileName);
                  return "File uploaded as " + info.FullName + " (" + info.Length + ")";
                    });
                    return fileInfo;

                });
                return task;
          }
          else
          {
     HttpResponseException(Request.CreateResponse(HttpStatusCode.NotAcceptable, "Invalid Request!"));
              return null;
          }
    }

But gives "Unexpected end of MIME multipart stream MIME multipart message is not complete" if called from Objective C code, this I figured out through tracing on the API side. Following is the Objective C method...

- (void) uploadFile
{
NSString *fileUploadSrvURL = @"http://server1/service/api/controller/uploadfile";

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:fileUploadSrvURL]];
[request setHTTPMethod:@"POST"];
NSString *boundary = @"---------------------------14737809831466499882746641449";
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
[request setValue:contentType forHTTPHeaderField:@"content-type"];

NSURL *fullFileURL = [self getFilePath:CurrentVisitId];
NSData *fileData = [NSData dataWithContentsOfURL:fullFileURL];

NSMutableData *body = [NSMutableData data];

[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"FileName\"; filename=\"%@\"\r\n",@"810474.rtf"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/rtf\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:fileData];
[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:body];

NSHTTPURLResponse* response =[[NSHTTPURLResponse alloc] init];
NSError* error = [[NSError alloc] init] ;

NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (error)
{

}

NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(@"%@", responseString);

}

As the ASP.net Web API side code works fine if integrated with HTML Form upload, so, probabaly there is something wrong with the way I am calling it from Objective C (I am new to Objective C)

Greg · Accepted Answer · 2013-11-25 16:35:32Z

1

I had similar issue and I manage to sorted it by creating a helper class (I found it online but I don't remember where):

public class CustomMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
{
    public CustomMultipartFormDataStreamProvider(string path)
        : base(path)
    { }

    public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers)
    {
        var name = !string.IsNullOrWhiteSpace(headers.ContentDisposition.FileName) ? headers.ContentDisposition.FileName : "NoName";
        return name.Replace("\"", string.Empty); //this is here because Chrome submits files in quotation marks which get treated as part of the filename and get escaped
    }
}

And you also needs to change couple of line in your code:

if (Request.Content.IsMimeMultipartContent())
        {
            string fullPath = HttpContext.Current.Server.MapPath("~/uploads");
            var streamProvider = new CustomMultipartFormDataStreamProvider(fullPath);
            var task = Request.Content.ReadAsMultipartAsync(streamProvider).ContinueWith<IEnumerable<string>>(t =>
            {
                if (t.IsFaulted || t.IsCanceled)
                {
                    throw new HttpResponseException(HttpStatusCode.InternalServerError);
                }
        ///.........
        /// rest of your code
}

The difference is that I call the web api via AFNetworking if it doesn't work for you I can share my AFNetworking code as well.

// EDITED My .h file

#import "AFHTTPClient.h"

typedef void (^DataResponseSuccessBlock)(id JSON);
typedef void (^DataResponseFailureBlock)(NSError *error);

@interface MyHTTPClient : AFHTTPClient


+ (MyHTTPClient *)sharedMyHTTPClient;

- (id)initWithBaseURL:(NSURL *)url;

- (void)saveTemplateData:(TemplateData*)data success:(DataResponseSuccessBlock)successBlock failure:(DataResponseFailureBlock)failureBlock;

@end

My .m file

@implementation GLHTTPClient
+ (MyHTTPClient *)sharedMyHTTPClient
{
    static dispatch_once_t pred;
    static MyHTTPClient *_sharedMyHTTPClient = nil;

    dispatch_once(&pred, ^{ _sharedMyHTTPClient = [[self alloc] initWithBaseURL:[NSURL URLWithString:kJSON_URL]]; });

    return _sharedMyHTTPClient;
}

- (id)initWithBaseURL:(NSURL *)url
{
    self = [super initWithBaseURL:url];
    if (!self)
    {
        return nil;
    }

    [self registerHTTPOperationClass:[AFJSONRequestOperation class]];
    [self setDefaultHeader:@"Accept" value:@"application/json"];
    [self setParameterEncoding:AFJSONParameterEncoding];

    return self;
}
- (void)saveTemplateData:(TemplateData*)data success:(DataResponseSuccessBlock)successBlock failure:(DataResponseFailureBlock)failureBlock
{
    NSData *imageData = UIImagePNGRepresentation(data.image);
    NSMutableURLRequest *request = [self multipartFormRequestWithMethod:@"POST" path:@"SaveData" //My web api class for uploading image
                                                             parameters:nil
                                              constructingBodyWithBlock:^(id <AFMultipartFormData>formData)
                                    {
                                        [formData appendPartWithFileData:imageData
                                                                    name:@"image"
                                                                fileName:@"image.png"
                                                                mimeType:@"image/png"];
                                    }];

    AFHTTPRequestOperation *op = [self HTTPRequestOperationWithRequest:request success:^(AFHTTPRequestOperation *operation, id responseObject) {
        if(successBlock)
            successBlock(responseObject);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        if(failureBlock)
           failureBlock(error);
    }];

    [self enqueueHTTPRequestOperation:op];
}
@end

I have change this code so if something doesn't work for you give me a shout and I can have a look on it again. You need to just call saveTemplateData:success:failure method and it should work.

edited Nov 25, 2013 at 16:35

answered Nov 25, 2013 at 15:17

Greg

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7 Comments

Pravin Over a year ago

Thanks for this helper suggestion, but even after integrating with this gives the same error.

Greg Over a year ago

Can you add to your code if (info.Exists){// LOG TO SEE HAVE YOU GOT THE FILE } just for debugging?

Pravin Over a year ago

Thanks Greg, I added that log and it doesn't go inside this block... var fileInfo = streamProvider.FileData.Select(i => {

Greg Over a year ago

Can you try add [HttpPost] attribute to your UploadFile method. If it won't work try use AFNetworking or NSURLSession to upload the image to web api.

Pravin Over a year ago

Thanks for all your help Greg, I am going to try integration with AFNetworking, will it be possible for you to share your code which uses AFNetworking to upload file?

|

user2557885 · Accepted Answer · 2016-11-23 08:00:41Z

We messed a lot with this problem on iOS specifically. Did't figured out - why hand made Http multipart request does that error on .Net Server, but went around with a simple AFNetworking (3) usage.

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
manager.responseSerializer = [AFJSONResponseSerializer serializer];
[manager.requestSerializer setValue:@"multipart/form-data" forHTTPHeaderField:@"Content-Type"];

[manager.requestSerializer setValue:[[App instance].login token] forHTTPHeaderField:@"Authorization"];

[manager POST:url   parameters:nil
    constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        for (UIImage *img in [params allValues]) {
            [formData appendPartWithFileData:UIImageJPEGRepresentation(img, 1) name:[NSString stringWithFormat:@"photo_%d",count] fileName:[NSString stringWithFormat:@"photo_%d.jpg",count] mimeType:@"image/jpeg"];
        }
        }
     progress:nil
      success:^(NSURLSessionDataTask *task, id response) {
          NSLog(@"Success");
      } failure:^(NSURLSessionDataTask *task, NSError *error) {
          NSLog(@"Error: %@", error);
      }];

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